身管精锻过程跨尺度多晶体塑性有限元模拟与织构预测

径向精锻是一种先进的身管制造方法。身管的多晶体材料经锻打后，晶粒会发生择优取向形成织构，在宏观上产生各向异性现象，这是普通有限元方法所无法模拟的。利用数学软件Matlab和程序设计语言Python联合编程并结合有限元软件ABAQUS，建立身管精锻宏观模型和细观多晶体模型；应用跨尺度方法，开发程序实现了宏观力学至微观力学边界条件的继承，使研究的晶粒尺寸达到了真实尺寸。分析微观多晶体模型的晶粒取向变化，使用Matlab编程画出锻后多晶体材料的极图和取向分布函数图，并用X射线衍射试验验证了晶粒取向模拟结果的正确性。建立了将身管径向精锻从宏观锻造到细观织构联系起来的一套研究方法，为预测锻后身管性能变化提供了思路。

Trans-scale Polycrystalline Finite Element Simulation of Radial Forging Process for Barrel and Prediction of Texture

Radial forging is an advanced manufacturing method for barrel. After the polycrystalline material of barrel is forged, the preferred orientation of the materials grain forms texture which presents the anisotropy phenomenon macroscopically. This phenomenon can not be simulated using the common finite element analysis (FEA) method. A macroscopic barrel radial forging FEA model and a microscopic polycrystalline plasticity FEA model are established based on ABAQUS code, the mathematical software Matlab and the programming language Python. The multi-scale method is used to program the boundary conditions inheriting from macro-mechanics state to meso-mechanics state which make the size of grain as reality. The pole figures of forged polycrystalline material and the orientation distribution function (ODF) figures are drawn by Matlab, which are used to analyze the orientation change of grain in the microscopic polycrystalline plasticity FEA model. The XRD experiment is used to validate the accuracy of the simulated results. A research method to connect macroscopic forging process and microscopic texture is presented, which provides a new way to predict the mechanical property of barrel after forging.